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CICS DEFINE INPUT EVENT - Input Event Definition and Configuration

CICS DEFINE INPUT EVENT provides input event definition and configuration capabilities in CICS environments. It enables programs to define input events, configure event parameters, and set up input event definitions for CICS applications.

What is CICS DEFINE INPUT EVENT?

CICS DEFINE INPUT EVENT is a command that allows programs to define input events, configure event parameters, and set up input event definitions in CICS environments. It provides input event definition capabilities, parameter configuration, and event setup for CICS applications.

Command Syntax

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EXEC CICS DEFINE INPUT EVENT
    EVENTID(event-id)
    [DESCRIPTION(description-text)]
    [EVENTTYPE(event-type)]
    [SOURCE(source-identifier)]
    [RESP(response-code)]
END-EXEC

Parameters

Required Parameters

  • EVENTID - Unique identifier for the input event

Optional Parameters

  • DESCRIPTION - Descriptive text for the input event
  • EVENTTYPE - Type of input event being defined
  • SOURCE - Source identifier for the input event
  • RESP - Response code variable

Input Event Types

Data Input Events

Events triggered by data input operations

  • • FILE INPUT - Events triggered by file input operations
  • • DATABASE INPUT - Events triggered by database input operations
  • • QUEUE INPUT - Events triggered by queue input operations
  • • STREAM INPUT - Events triggered by data stream input

User Input Events

Events triggered by user interactions

  • • TERMINAL INPUT - Events triggered by terminal input
  • • KEYBOARD INPUT - Events triggered by keyboard input
  • • MOUSE INPUT - Events triggered by mouse interactions
  • • TOUCH INPUT - Events triggered by touch screen input

Network Input Events

Events triggered by network communications

  • • SOCKET INPUT - Events triggered by socket input
  • • HTTP INPUT - Events triggered by HTTP requests
  • • MESSAGE INPUT - Events triggered by message reception
  • • PACKET INPUT - Events triggered by network packet reception

System Input Events

Events triggered by system operations

  • • INTERRUPT INPUT - Events triggered by system interrupts
  • • SIGNAL INPUT - Events triggered by system signals
  • • TIMER INPUT - Events triggered by timer expiration
  • • EXCEPTION INPUT - Events triggered by system exceptions

Programming Examples

Basic Input Event Definition

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DEFINE01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT001'.
       01  DESCRIPTION      PIC X(50) VALUE 'File Input Processing Event'.
       01  EVENT-TYPE       PIC X(20) VALUE 'FILE_INPUT'.
       01  SOURCE-ID        PIC X(20) VALUE 'INPUT_FILE_01'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DEFINE INPUT EVENT
               EVENTID(EVENT-ID)
               DESCRIPTION(DESCRIPTION)
               EVENTTYPE(EVENT-TYPE)
               SOURCE(SOURCE-ID)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Input event defined successfully'
           ELSE
               DISPLAY 'Failed to define input event'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Terminal Input Event Definition

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DEFINE02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT002'.
       01  DESCRIPTION      PIC X(50) VALUE 'Terminal Input Processing Event'.
       01  EVENT-TYPE       PIC X(20) VALUE 'TERMINAL_INPUT'.
       01  SOURCE-ID        PIC X(20) VALUE 'TERMINAL_001'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DEFINE INPUT EVENT
               EVENTID(EVENT-ID)
               DESCRIPTION(DESCRIPTION)
               EVENTTYPE(EVENT-TYPE)
               SOURCE(SOURCE-ID)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Terminal input event defined'
               DISPLAY 'Event ID: ' EVENT-ID
               DISPLAY 'Event Type: ' EVENT-TYPE
               DISPLAY 'Source: ' SOURCE-ID
           ELSE
               DISPLAY 'Failed to define terminal input event'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Error Handling with Input Event Definition

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DEFINE03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT003'.
       01  DESCRIPTION      PIC X(50) VALUE 'Network Input Processing Event'.
       01  EVENT-TYPE       PIC X(20) VALUE 'NETWORK_INPUT'.
       01  SOURCE-ID        PIC X(20) VALUE 'SOCKET_001'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DEFINE INPUT EVENT
               EVENTID(EVENT-ID)
               DESCRIPTION(DESCRIPTION)
               EVENTTYPE(EVENT-TYPE)
               SOURCE(SOURCE-ID)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   DISPLAY 'Input event defined successfully'
                   DISPLAY 'Event ID: ' EVENT-ID
               WHEN DFHRESP(DUPRES)
                   DISPLAY 'Input event already exists'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid definition request'
               WHEN DFHRESP(EVENTERR)
                   DISPLAY 'Event-specific error occurred'
               WHEN DFHRESP(PARAMERR)
                   DISPLAY 'Parameter error in definition'
               WHEN OTHER
                   DISPLAY 'Unexpected error occurred'
           END-EVALUATE
           
           EXEC CICS RETURN END-EXEC.

Input Event Configuration

Source Configuration

  • • File Sources - Configure file-based input event sources
  • • Database Sources - Configure database-based input event sources
  • • Network Sources - Configure network-based input event sources
  • • System Sources - Configure system-based input event sources

Processing Configuration

  • • Immediate Processing - Process input events immediately upon receipt
  • • Batch Processing - Process input events in batches or groups
  • • Deferred Processing - Queue input events for later processing
  • • Scheduled Processing - Process input events at scheduled intervals

Validation Configuration

  • • Data Validation - Validate input data format and content
  • • Source Validation - Validate input event source authenticity
  • • Format Validation - Validate input data format and structure
  • • Security Validation - Validate input event security and authorization

Monitoring Configuration

  • • Event Monitoring - Monitor input event processing status
  • • Performance Monitoring - Monitor input event processing performance
  • • Error Monitoring - Monitor errors in input event processing
  • • Audit Monitoring - Log and audit input event processing activities

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - Input event defined successfully
  • DFHRESP(DUPRES) - Input event already exists
  • DFHRESP(INVREQ) - Invalid definition request
  • DFHRESP(EVENTERR) - Event-specific error
  • DFHRESP(PARAMERR) - Parameter error in definition
  • DFHRESP(DEFINEERR) - Definition-specific error

Performance Considerations

Definition Efficiency

  • • Optimize event parameters - Use appropriate values for event types and sources
  • • Minimize definition overhead - Reduce the computational cost of event definitions
  • • Use efficient definition patterns - Implement definition strategies that minimize resource usage
  • • Monitor definition performance - Track the performance impact of definition operations

Resource Impact

  • • Monitor resource usage - Track how definition operations consume system resources
  • • Optimize resource allocation - Ensure efficient allocation of resources for definitions
  • • Manage resource cleanup - Properly release resources after definition operations
  • • Track resource utilization - Monitor the overall resource consumption patterns

Best Practices

Input Event Definition Best Practices

  • • Always check response codes
  • • Use appropriate definition parameters
  • • Implement proper error handling
  • • Set realistic source configurations
  • • Use meaningful event descriptions
  • • Optimize definition operations
  • • Clean up resources properly

Explain It Like I'm 5 Years Old

Think of CICS DEFINE INPUT EVENT like setting up a mailbox:

  • • Mailbox Name: "What to call your mailbox" - The event ID
  • • Instructions: "How the mailbox works" - The description
  • • Mailbox Type: "What kind of mailbox" - The event type
  • • Where Mail Comes From: "Who sends mail" - The source
  • • Setup: "Getting everything ready" - Defining the event

Exercises

Exercise 1: Basic Input Event Definition

Create a program that defines a basic input event with standard parameters.

Exercise 2: Source Configuration

Write a program that defines input events with different source configurations.

Exercise 3: Error Handling

Implement comprehensive error handling for input event definition failures and parameter errors.

Related Concepts

Event Management

Managing system events

Input Processing

Processing input data

Event Configuration

Configuring event parameters

Data Validation

Validating input data

Error Handling

Managing definition errors